US6322923B1ExpiredUtility

Separator for gel electrolyte battery

90
Assignee: CELGARD INCPriority: Jan 30, 1998Filed: Jan 30, 1998Granted: Nov 27, 2001
Est. expiryJan 30, 2018(expired)· nominal 20-yr term from priority
Inventors:Robert M. SpotnitzCharles Glen Wensley
H01M 50/417H01M 50/426H01M 50/489H01M 50/449H01M 50/411Y02P70/50Y02E60/10H01M 2300/0085H01M 10/0525
90
PatentIndex Score
120
Cited by
18
References
21
Claims

Abstract

A battery separator for a gel electrolyte battery includes a microporous membrane; and an adherent coating thereon, or a gel-forming coating thereon, the gel-forming coating including a gel-forming polymer and a plasticizer. The gel-forming polymer is preferably a poly(vinylidene fluoride:hexafluoropropylene) copolymer, and the plasticizer is preferably an ester.

Claims

exact text as granted — not AI-modified
We claim:  
     
       1. A battery separator comprising: 
       a microporous polyolefin membrane; and  
       a coating thereon, said coating having a surface density <0.3 mg/cm 2 , and said coating further consisting essentially of a poly(vinylidene fluoride:hexafluoropropylene) copolymer.  
     
     
       2. The separator of claim  1  wherein said surface density ranges from 0.05 to <0.3 mg/cm 2 . 
     
     
       3. The separator of claim  1  wherein said surface density ranges from 0.1 to 0.25 mg/cm 2 . 
     
     
       4. A battery with the separator of claim  1 . 
     
     
       5. The battery of claim  4  being a lithium ion battery. 
     
     
       6. The separator of claim  1  being a shutdown separator. 
     
     
       7. A battery separator comprising: 
       a microporous polyolefin membrane; and  
       a gel-forming coating thereon, said coating consisting essentially of an absorbing or gel-forming polymer and a plasticizer being an ester.  
     
     
       8. The battery separator according to claim  7  wherein said ester is a phthalate. 
     
     
       9. The battery separator according to claim  8  wherein said phthalate is dibutyl phthalate. 
     
     
       10. A battery with the separator of claim  9 . 
     
     
       11. The battery of claim  10  being a lithium ion battery. 
     
     
       12. The separator of claim  9  wherein said membrane being a shutdown separator. 
     
     
       13. A battery separator comprising: 
       a microporous polyolefin membrane; and  
       a gel-forming coating thereon, said coating consisting essentially of an absorbing or gel forming polymer being a poly(vinylidene fluoride:hexafluoropropylene) copolymer and a plasticizer.  
     
     
       14. A battery with the separator of claim  13 . 
     
     
       15. The battery of claim  14  being a lithium ion battery. 
     
     
       16. The battery of claim  15  wherein said separator being a shutdown separator. 
     
     
       17. A battery separator for a lithium battery comprising: 
       a microporous polyolefin membrane having a thickness ranging from 5 to 500 μ, pore diameters ranging from 0.01 to 10 μ, a porosity ranging from 35 to 85% and being made by either a dry stretch process or a solvent process; and  
       a coating on said membrane, said coating consisting essentially of a gel forming polymer being a poly(vinylidene fluoride:hexafluoropropylene) copolymer and a plasticizer.  
     
     
       18. The separator of claim  17  being a shutdown separator. 
     
     
       19. A battery separator for a lithium battery comprising: 
       a microporous polyolefin membrane having a thickness ranging from 5 to 500 μ, pore diameters ranging from 0.01 to 10 μ, a porosity ranging from 35 to 85% and being made by either a dry stretch process or a solvent process; and  
       a coating on said membrane, said coating consisting essentially of a gel forming polymer and a plasticizer being an ester.  
     
     
       20. The separator of claim  19  wherein said ester being a phthalate. 
     
     
       21. The separator of claim  20  wherein said phthalate being dibutylphthalate.

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